Piston-ring



J; MILLER.

PISTON RING, APPLICATION FILED 020.24, 1919.

Patented 1, 1921,

7 J INVENTOR fifo'lten' B7 ArrbmvfyS WITNESSES g Za UNITED STATES PATENT OFFICE.

JOSEPH MILLER, OF ALBAIN' Y, NEW YORK.

PISTON-RING.

To all whom it may concern:

Be it known that I, JOSEPH MILLER, acitizen of the United States, and a resident of Albany, in the county of Albany and State of New York, have invented new and Improved Piston-Rings, of which the following is a full, clear, and exact description.

This invention relates to piston rings of the sectional type, and it has for its general objects to provide a'ring of this character which is of comparatively simple and inexoensive construction, reliable and eificient use, and so designed as to effectively prethe piston ring and cylinder, the meeting faces of the piston rings having shallow grooves extending half way around each section on the side opposite from the opening or split of the section, such groove insuring the maintenance of a film of oil between the sections.-

lVith such objects in view, and others which will appear as the description proceeds, the invention comprises various novel features of construction and arrangement of parts which will be set forth with particularity in the following description and claims appended hereto.

In the accompanying drawing which illustrates one embodiment of the invention and wherein similar characters of reference indicate corresponding parts in all theviews,

Figures 1 and 2 are plan views of the two sections of the ring, the section shown in Fig. 2 appearing as if it had been lifted off the section in Fig. l and turned over;

Fig. 3 is a plan view of the ring;

Fig. l is an enlarged transverse section; and

Figs. 5 and 6 are transverse sectional views respectively on the lines 55 and 6-6, Fig; 3.

Referring to the drawing, 1 and 2 designate the two sections of the piston ring, each section being split or open at 3, and the middle at of the ring section opposite the opening 3 is of maximum thickness and it gradually tapers therefrom to the ends When the ring sections are assembled in proper relation the thickest part of one see- Specification of Letters Patent.

tion 'is directly over the opening or split of the other section, and to maintain this relation a pin 7) is arranged on the section 2 and normally lies between the ends 5 of the section 1. The two sections when placed together constitute the ring which is of the same thickness at all points. The abutting faces 6 of the two ring sections are provided with semi-circular grooves 7 which are deepest at the middle point 4 and gradually become more shallow at a point approximately ninety degrees from each side of the middle 4. These channels are exposed at the openings 3 so that the lubricant can he scraped off from the walls. of the cylinder and keep the channels filled, so that a film of lubricant is always maintained between the ring sec tions. By reason of the ring sections being tapered there is a lateral sliding action which tends to force the rings outwardly, which together with the resiliency of the rings, maintains an effective engagement with the cylinder wall.

From the foregoing description taken in connection with the accompanying drawing, the advantages of the construction. and method of operation will be readily understood by those skilled in the art to which the invention appertains, and while I have described the principle of. operation, together with the article which I now consider to be the best embodiment thereof, I desire to have it understood that the article shown is merely illustrative and that such changes Patented Mar. 1, 1921.

Application filed December 24, 1919. Serial No. 347,072. I

may be made when desired as fall within the l 1. A piston ring composed of oppositely disposed sections split or open and each thickest at a point opposite its opening, and gradually tapering toward the latter, and grooves on the abutting faces of the sec tions.

2. A piston ring composed of a pair of oppositely disposed sections slidable one on the other and each section being open and having its thickest portion at a point diametrically opposite the opening, semi-circular grooves in the abutting surfaces of the sections, each groove being deepest at the thickest point of its respective section, and means for preventing relative turning of the sections, the ring formed by thesections being of the same thickness at all points.

' JOSEPH MILLER. 

